* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
body {
  font-family: Helvetica Neue, Tahoma, Arial, PingFangSC-Regular, Hiragino Sans GB, Microsoft Yahei, sans-serif;
}
a {
  color: #333;
  text-decoration: none;
}
img {
  vertical-align: middle;
  width: 100%;
  height: 100%;
}
ul {
  list-style: none;
}
.ellipsis-2 {
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
@keyframes rotate {
  0% {
    transform: rotateX(-15deg) rotateY(0deg);
  }
  100% {
    transform: rotateX(-15deg) rotateY(360deg);
  }
}
@keyframes shade {
  50% {
    background-color: rgba(0, 0, 0, 0.7);
  }
}
body,
html {
  width: 100%;
  height: 100%;
  margin: 0px;
}
body .main-aside {
  position: fixed;
  width: 14.8%;
  left: 0;
  top: 0;
  bottom: 0;
  background-color: #343a40;
}
body .main-aside .header3D {
  transform: translateY(50%);
  display: flex;
  justify-content: center;
  perspective: 900px;
}
body .main-aside .header3D .cube {
  width: 100px;
  height: 100px;
  position: relative;
  transform-style: preserve-3d;
  animation: rotate 10s linear infinite;
}
body .main-aside .header3D .cube:after {
  content: '';
  width: 100%;
  height: 100%;
  box-shadow: 0 0 50px rgba(0, 0, 0, 0.2);
  position: absolute;
  transform-origin: bottom;
  transform-style: preserve-3d;
  transform: rotateX(90deg) translateY(50px) translateZ(-50px);
  background-color: rgba(0, 0, 0, 0.1);
}
body .main-aside .header3D .cube div {
  background-color: rgba(64, 158, 255, 0.7);
  position: absolute;
  width: 100%;
  height: 100%;
  border: 1px solid #1b63aa;
  box-shadow: 0 0 60px rgba(64, 158, 255, 0.7);
}
body .main-aside .header3D .cube div:nth-child(1) {
  transform: translateZ(-50px);
  animation: shade 10s -5s linear infinite;
}
body .main-aside .header3D .cube div:nth-child(2) {
  transform: translateZ(50px) rotateY(180deg);
  animation: shade 10s linear infinite;
}
body .main-aside .header3D .cube div:nth-child(3) {
  transform-origin: right;
  transform: translateZ(50px) rotateY(270deg);
  animation: shade 10s -2.5s linear infinite;
}
body .main-aside .header3D .cube div:nth-child(4) {
  transform-origin: left;
  transform: translateZ(50px) rotateY(90deg);
  animation: shade 10s -7.5s linear infinite;
}
body .main-aside .header3D .cube div:nth-child(5) {
  transform-origin: bottom;
  transform: translateZ(50px) rotateX(90deg);
  background-color: rgba(0, 0, 0, 0.7);
}
body .main-aside .header3D .cube div:nth-child(6) {
  transform-origin: top;
  transform: translateZ(50px) rotateX(270deg);
}
body .main-aside .asideOption {
  position: relative;
  top: 120px;
  left: 0;
  background-color: #fff;
  height: 50%;
}
body .main-aside .asideOption ul {
  height: 100%;
}
body .main-aside .asideOption ul li {
  height: 10%;
  border: 1px solid #000;
}
body .main-aside .asideOption ul li a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  height: 100%;
}
body .main-aside .asideOption ul li a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}
body .main-aside .asideOption ul li a:hover span,
body .main-aside .asideOption ul li a:hover i {
  color: #f3f7fa;
  font-weight: bold;
}
body .main-aside .asideOption ul li a span,
body .main-aside .asideOption ul li a i {
  color: #c2c7d0;
}
body .main-content {
  margin-left: 14.8%;
  background-color: #ddd;
}
body .main-content .main-headernav {
  position: fixed;
  top: 0;
  left: 14.8%;
  right: 0;
  height: 60px;
  background-color: #343a40;
}
body .main-content .main-headernav button {
  float: right;
  width: 200px;
  height: 60px;
}
body .main-content .show-content {
  margin-top: 60px;
  height: 100vh;
  background-color: #96e6ec;
  background-image: url(../img/cool-background.png);
}
